długość łuku=α/360×2πr
8πcm=30/360×2πr /:2π
4=30/360×r
r=4:³⁰/₃₆₀=48cm
pole koła=πr²=π×48²=2304πcm²
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długość łuku=α/360×2πr
8πcm=30/360×2πr /:2π
4=30/360×r
r=4:³⁰/₃₆₀=48cm
pole koła=πr²=π×48²=2304πcm²